Hinged straight edge clamp

ABSTRACT

The present invention relates to a straight edge clamp that has a clamping head assembly and a stop assembly mounted upon the body of the straight edge. The head and stop are not connected together and the stop assembly is free to move with respect to the head assembly. The straight edge clamp body includes at least two sections that are hinged together to allow the sections to be folded upon one another when not in use and unfolded when in use.

RELATED APPLICATIONS

This application is a Continuation-In-Part and claims the benefit ofU.S. patent application Ser. No. 14/243,935 filed on filed on Apr. 3,2014.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH

NONE

TECHNICAL FIELD

This invention relates generally to a straight edge clamp and, moreparticularly, to a straight edge clamp with a unique clamping systemwhich reduces weight and costs and a unique hinge system that permitsthe straight edge to be easily folded and unfolded between use andstorage positions.

BACKGROUND

Straight edge clamps are well none for use in making straight cuts withfor example a circular saw, or for guiding a router on materials, suchas wood, aluminum plastic, etc. Straight edge clamps provide a straightedge secured to a work piece or work pieces so that a power tool or aguide for a power tool can be moved along the straight edge, forexample, to form a cut edge with a circular hand saw or to form atrimmed edge with a hand router. Also, straight edge clamps are used forthe purpose of holding accessory tools against a work piece.

U.S. Pat. No. 6,622,997 discloses a typical straight edge clamp. Thestraight edge clamp disclosed in the '997 patent includes a straightedge that is made of extruded aluminum and has an open channel, a fixedstop, a sliding stop that is received in the channel and can slide alongthe straight edge, and a bar or rod clamp that connects the sliding stopto the fixed stop. The bar extends the length of the straight edge.

The sliding stop has a body that is inserted in the channel of thestraight edge, and a jaw that protrudes from the body and out of thechannel to secure a work piece. The rod and interaction of the slidingstop perform the clamping function. In the locked state, the slidingstop can move toward the fixed stop since the body pushes the lockingelements, a series of plates mounted on the rod, near the center of therod and the pushing force is applied uniformly around the hole, and thelocking elements can slide along the rod. However, moving in reversedirection is blocked since the slider pushes the ends of the lockingelement and the pushing force is applied at a point offset from thecenter of the holes and the rod, thereby locking the holes on the rod.

The main problem with known straight edge clamps is the need for the rodextending the length of the straight edge and the locking elements. Therod and the locking elements increase the cost of the clamp and theweight. The need for the rod also defines the length of the clamp. Theclamp has a predetermined length that cannot be adjusted. The clamplength cannot be changed. Additionally, the clamp cannot be folded,since the rod is rigid and prevents any change in the length of thestraight edge.

SUMMARY OF THE INVENTION

In general terms, this invention provides a straight edge clamp and,more particularly, a straight edge clamp having at least two sectionsthat can folded upon one another for storage. The straight edge clamp ofthe present invention has a unique clamping system that doesn't requirethe rod or locking elements of known straight edge clamps.

The straight edge clamp of the present invention includes an elongatedbody, a clamping head assembly and an end stop assembly. There is no rodconnecting the clamping head assembly and the end stop assembly, theyare independently mounted and can be separately moved within theelongated body.

In the disclosed embodiment, the elongated body includes three sectionsand two hinge connectors for connecting the sections to form theelongated body. It should be appreciated by those of ordinary skill inthe art that the number of sections determines the length of thestraight edge clamp. Any number of sections can be connected together toform the straight edge clamp. In the disclosed embodiment two of thesections are approximately two feet in length and the end section isshorter, having a length of about eighteen (18) inches. The sectionlengths can be any other length and can all be the same length ifdesired.

The ability to fold the sections, due to the unique clamping system,allows a user to fold the sections when not in use for easy storage andunfold the sections when in use. Another benefit of the folding sectionsis that the straight edge clamp of the present invention is easier andless costly to ship than conventional straight edge clamps since it canbe packaged in a smaller package, the general size of the foldedsections. It is also less susceptible to damage during shipping and use,since it can be folded. A still further benefit of the folding sectionsis that it is easier to display at the point of purchase when comparedto conventional straight edge clamps. With the straight edge clamp ofthe present invention, the sections can be folded for display.

The elongated body has opposed edges, a top and a bottom. A main channelis formed in the bottom. The clamping head assembly and the stopassembly are mounted within the main channel a spaced distance from oneanother. The clamping head assembly has a movable jaw that is movable inthe direction of the stop assembly, from a released position to aclamped position. The stop assembly has a jaw that is movable in thedirection away from said first jaw from an unlocked position to a lockedposition. The clamping head assembly and the stop assembly can also bemoved along the elongated body with respect to one another. The clampinghead assembly and the stop assembly are not connected together allowingthe clamp head assembly and the stop assembly to be moved with respectto one another along the entire length of the elongated body.

In use, the sections are unfolded and the bottom of the elongated bodyis positioned against a work surface. The work surface has sides and theclamping head assembly and stop assembly are adapted to be positionedagainst the sides. Once positioned, the first and second jaws are movedto the clamped position. In one of the disclosed embodiments, the secondjaw is moved to the clamped position by rotating a handle. The first jawis moved to the locked position upon movement of the second jaw. Thesecond jaw pulls the elongated body in the direction away from the stopassembly, which in turn pushes the first jaw of the end stop into thelocked position. As a result, the straight edge clamp is locked onto thework surface.

These and other features and advantages of this invention will becomemore apparent to those skilled in the art from the detailed descriptionof a preferred embodiment. The drawings that accompany the detaileddescription are described below.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the folding straight edge clamp of thepresent invention;

FIG. 2 is a an end view of the elongated body of the present invention;

FIG. 3 is a perspective view of the clamping head assembly of thepresent invention.

FIG. 4 is a perspective view of the end stop assembly of the presentinvention;

FIG. 5 is a partial side view of the hinge and elongated body sectionsof the present invention partially unfolded.

FIG. 6 is a partial side view of the hinge and elongated sections of thepresent invention in the folded position.

FIG. 7 is a side view of the folding straight edge clamp of the presentinvention.

FIG. 8 is an end view of the base of the first jaw of the presentinvention.

FIG. 9 is a perspective view of the base of FIG. 8.

FIG. 10 is a perspective view of the wedge member of the presentinvention.

FIG. 11 is a perspective view of the straight edge clamp of the presentinvention in the unfolded position.

FIG. 12 is a top view of the straight edge clamp of the presentinvention in the folded position.

FIG. 13 is a partial end view of the hinge of the present invention.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT

With reference to FIGS. 1, 7, 8 and 9, the straight edge clamp of thepresent invention is shown generally at 10. The straight edge clamp 10includes an elongated body 12 that includes sections 15, a clamping headassembly 14 and an end stop assembly 16.

The elongated body 12 includes at least two sections 15 and in thedisclosed embodiment three sections 15 connected together by hinges 19to form the elongated body 12. It will be appreciated by those ofordinary skill in the art that the number of sections 15 that areconnected together will determine the length of the straight edge clamp10. By way of example, two of the sections in the disclosed embodimentare each approximately two feet in length and the third section 15 isabout eighteen inches. It should be understood by those of ordinaryskill in the art that any length and number of sections could be usedand that they could all be the same length if desired, or differentlengths.

With reference to FIG. 2, the profile of the elongated body 12 is shown.The elongated body 12 includes a top surface 21 and a bottom surface 23.The bottom surface 23 has spaced openings 22 adjoining a generallyc-shaped central channel 24. In the disclosed embodiment, the centralchannel 24 has protrusions 26 and locator rails 28 protruding into thechannel 24. There are also optional outer attachment ribs 30 andattachment grooves 20. These can be used to attach other items to thestraight edge clamp 10. Also as illustrated, serration grooves 27 areprovided along the walls 25 to add additional resistance to the lockingmechanism which will be discussed in greater detail below.

With reference to FIG. 4, the end stop 16 will be described in greaterdetail. The end stop 16 has a base 32 that slides into and along thechannel 24. There is a handgrip 34 on the base that facilitates themovement of the end stop along the channel 24. A first jaw 36 is movablymounted upon the base 32 and can be moved from a released position to alocked position. Clamp pads 38 are mounted within the base 32 and can beforced outwardly by the movement of the first jaw 36 to the lockedposition. The clamp pads 38 engage the sidewalls 25 (see FIG. 2) whenthe end stop 16 is in the locked position.

The first jaw 36 has limit tabs 40 that engage limit tabs 42 on the base32. The limit tabs 42 restrict the movement of the first jaw 36 withinthe base 32.

With reference to FIGS. 8, 9 and 10, the base 32 includes a passage 35that receives a wedge member 50 extending from the first jaw 36. Thewedge member 50 has angled sides that engage the clamp pads 38 and forcethem to the locked position when the wedge member 50 is forced into thepassage 35. The wedge member is forced into the passage 35 and againstthe clamp pads 38, when the clamping head assembly 14 is engaged, aswill be described in greater detail below. It should be appreciated bythose of ordinary skill the art that the wedge member 50 could have asingle side extending at an acute angle to the longitudinal center lineof the straight edge body 12 and that only one clamp pad 38 would beneeded.

Guide fingers 46 extend out of the base 32 and into guide finger pockets48, see FIG. 10. The fingers 46 in the first pockets 48 align the firstjaw 36 and facilitate its movement with respect to base 32. A secondpocket 55 can also be provided to receive a spring to bias the first jaw36 to the released position.

With reference to FIG. 3, the clamping head assembly 14 will bedescribed. The clamping head assembly 14 is fitted into the end of oneof the sections of the elongated straight edge body 12. The clampinghead assembly includes a second jaw 52 and a clamp actuation handle 54.The second jaw 52 is movably mounted in a clamp body 56. The handle 54includes a cam member 57 that engages and pushes the second jaw in tothe direction of the stop assembly 16 when the handle 54 is rotated.Guides 58 engage the rails 28 to facilitate the movement of the secondjaw 52. Limit tabs 60 and 62 limit the movement of the second jaw 52.

In use, the bottom surface 23 of the elongated body 12 is positionedagainst a work surface. The work surface has sides and the clamping headassembly 14 and stop assembly 16 are adapted to be positioned againstthe sides. The second jaw 52 is positioned against one side of the worksurface and the end stop assembly 16 is moved to engage the first jaw 36against the other side of the work surface. Once positioned, the secondjaw 52 is moved to the clamped position. In the disclosed embodiment,the second jaw 52 is moved to the clamped position by rotating handle54. The first jaw 36 is moved to the locked position upon movement ofthe second jaw 52. The second jaw 52 pulls the elongated body 12 in thedirection away from the stop assembly 16, which in turn pushes the firstjaw 36 of the end stop 16 into the locked position. As a result, thestraight edge clamp is locked onto the work surface.

With reference to FIGS. 1, 5 through 7, and 11 through 13, the hingeconnector assembly of the present invention will be described. The hingeconnector assembly of the present invention is shown generally at 19.The hinge 19 has a base 72 with opposed first knuckles 74. The knuckles74 have fingers 76. The knuckles 74 are connected to four secondknuckles 78, each with fingers 80. The four second knuckles 74 are eachreceived within openings 22 in the sections 15 of the elongated body 12.The second knuckles 74 have protrusions (not shown) that are press fitinto the openings 22. It will be understood that the second knucklescould be connected to the sections 15 by other known methods, such asscrews, glue, etc. The fingers 76 of the knuckles 74 and fingers 80 ofthe knuckles 78 mate to form a hinge joint. A hinge pin 82 interconnectsthe knuckles 74 and 78. The hinge pin 82 is received within a holeformed in both sets of knuckles 74 and 78.

As illustrated, in the disclosed embodiment, the knuckles 74 and 78extend outwardly from the base 72. This is important to the operation ofthe straight edge clamp and has a two-fold purpose. First, when thestraight edge clamp is open, one side of the base 72 is parallel withthe top of the elongated body to from a continuous flat surface.Additionally, when the straight edge is open, the opposite side of thebase 72 is generally parallel to the inside top wall of the channel 24.In this way, the base 72 and knuckles 74 form a secondary channel 75which is parallel with the channel 24 when the straight edge isunfolded. In this way, the channel 24 is continuous along its length andthe clamping head assembly 14 and the end stop assembly 16 are free tobe moved along its length. As will be appreciated, the base 72 isgenerally the same thickness as the thickness of the top of theelongated member 12.

In use, the clamping head assembly 14 and the end stop assembly 16 areboth moved to one of the end most sections 15. The other sections 15 arethen folded under one another to fold the elongated body, see FIGS. 1and 12. To use, the sections 15 are unfolded as shown in FIG. 11 andthen the clamping head assembly 14 and end stop assembly 16 can be movedto their desired positions along the elongated body 12.

The foregoing invention has been described in accordance with therelevant legal standards, thus the description is exemplary rather thanlimiting in nature. Variations and modifications to the disclosedembodiment may become apparent to those skilled in the art and do comewithin the scope of the invention. Accordingly, the scope of legalprotection afforded this invention can only be determined by studyingthe following claims.

What is claimed is:
 1. A straight edge clamp comprising; an elongated body having a length and a longitudinal centerline, a clamping head assembly and an end stop assembly; said elongated body has opposed edges, a top and a bottom, a central channel formed in said bottom, said clamping head assembly and said stop assembly are mounted within said central channel a spaced distance from one another; said stop assembly has a movable first jaw which is movable with respect to said clamping head assembly, from an unlocked position to a locked position; said clamping head assembly has a second jaw which is movable with respect to said first jaw from a released position to a clamped position, said bottom of said elongated body is adapted to be positioned against a work surface having sides and said clamping head assembly and stop assembly are adapted to be positioned against the sides, said second jaw is moved to said clamped position and said first jaw is moved to said locked position to clamp said straight edge clamp to said work surface; said elongated body having at least two separate sections connected by a hinge such that said at least two separate sections can be folded with one section positioned upon the other section when not in use and unfolded when in use, with said sections being generally parallel; said stop assembly includes at least one clamp pad mounted adjacent said first jaw, said first jaw being moveable with respect to said at least one clamp pad to move said clamp pad into engagement with said elongated body to said locked position.
 2. The straight edge clamp of claim 1, wherein said central channel has sidewalls, said first jaw being moveable with respect to said at least one clamp pad to move said clamp pad into engagement with at least one of said sidewalls to said locked position.
 3. The straight edge clamp of claim 1, wherein said first jaw includes at least one side wall extending at an acute angle with respect to said longitudinal center line of said elongated body.
 4. The straight edge clamp of claim 1, further including a pair of clamp pads mounted adjacent said first jaw, said first jaw being moveable with respect to said clamp pads to move said clamp pads into engagement with said elongated body to said locked position.
 5. The straight edge clamp of claim 4, wherein said first jaw includes sidewalls extending at an acute angle with respect to the longitudinal center line of said elongated body, said sidewalls engaging said pads to force said pads against said elongated body.
 6. The straight edge clamp of claim 1, wherein said second jaw has a cam surface rotatable into engagement with said second jaw to move said second jaw between said released position to said clamped position.
 7. The straight edge of clamp of claim 1, wherein said stop assembly is movable along said length of said elongated body with respect to said clamping assembly.
 8. The straight edge clamp of claim 1, wherein said hinge is a double hinge.
 9. The straight edge clamp of claim 1, wherein said hinge includes mating first and second sets of knuckles, with said second set of knuckles being connected to said sections and said first set of knuckles being connected to said second set of knuckles.
 10. The straight edge clamp of claim 9, wherein said sections have openings for receipt of said second set of knuckles.
 11. The straight edge clamp of claim 9, wherein said hinge includes a base positioned between said first set of knuckles, said base being generally contiguous with said top of said elongated body when said sections of said straight edge clamp are generally parallel.
 12. The straight edge clamp of claim 11, wherein said first set of knuckles and said base define a secondary channel which is contiguous with said central channel when said sections are generally parallel, said clamping head assembly and said end stop assembly being moveable within said secondary channel and adapted to be clamped within said secondary channel as well as said central channel.
 13. A straight edge clamp comprising: an elongated body, said elongated body including at least two sections, and at least one hinge for connecting said sections to form a unitary elongated body; said elongated body has opposed edges, a top and a bottom, and a central channel formed in said bottom, a clamping head assembly and an end stop assembly within said central channel; a locking mechanism to lock said clamping head assembly and said end stop assembly; whereby said bottom of said elongated body is adapted to be positioned against a work surface having sides and said stop assembly is adapted to be positioned against one of the sides, and said locking mechanism is moved to said clamped position; said elongated body having at least two separate sections connected by a double hinge such that said at least two separate sections can be folded with one section positioned upon the other section when not in use and unfolded when in use.
 14. The straight edge clamp of claim 13, wherein said hinge includes mating first and second sets of knuckles, with said second set of knuckles being connected to said sections and said first set of knuckles being connected to said second set of knuckles.
 15. The straight edge clamp of claim 14, wherein said sections have openings for receipt of said second set of knuckles.
 16. The straight edge clamp of claim 14, wherein said hinge includes a base positioned between said first set of knuckles, said base being generally contiguous with said top of said elongated body when said straight edge clamp is unfolded for use.
 17. The straight edge clamp of claim 16, wherein said first set of knuckles and said base define a secondary channel which is contiguous with said central channel when said sections are unfolded, said clamping head assembly and said end stop assembly being moveable within said secondary channel and adapted to be clamped within said secondary channel as well as said central channel.
 18. A straight edge clamp comprising; an elongated body a length and a longitudinal centerline, a clamping head assembly and an end stop assembly; said elongated body has opposed edges, a top and a bottom, a central channel formed in said bottom, said clamping head assembly and said stop assembly are mounted within said central channel a spaced distance from one another; said stop assembly has a movable first jaw which is movable with respect to said clamping head assembly, from an unlocked position to a locked position; said clamping head assembly has a second jaw which is movable with respect to said first jaw from a released position to a clamped position, said bottom of said elongated body is adapted to be positioned against a work surface having sides and said clamping head assembly and stop assembly are adapted to be positioned against the sides, said second jaw is moved to said clamped position and said first jaw is moved to said locked position to clamp said straight edge clamp to said work surface; said elongated body having at least two separate sections connected by a hinge such that said at least two separate sections can be folded with one section positioned upon the other section when not in use and unfolded when in use, with said sections being generally parallel; said hinge is a double hinge.
 19. The straight edge clamp of claim 18, wherein said stop assembly includes at least one clamp pad mounted adjacent said first jaw, said first jaw being moveable with respect to said at least one clamp pad to move said clamp pad into engagement with said elongated body to said locked position.
 20. The straight edge clamp of claim 19, wherein said central channel has sidewalls, said first jaw being moveable with respect to said at least one clamp pad to move said clamp pad into engagement with at least one of said sidewalls to said locked position.
 21. The straight edge clamp of claim 19, wherein said first jaw includes at least one side wall extending at an acute angle with respect to the longitudinal center line of said elongated body.
 22. The straight edge clamp of claim 18, further including a pair of clamp pads mounted adjacent said first jaw, said first jaw being moveable with respect to said clamp pads to move said clamp pads into engagement with said elongated body to said locked position.
 23. The straight edge clamp of claim 22, wherein said first jaw includes sidewalls extending at an acute angle with respect to said longitudinal center line of said elongated body, said sidewalls engaging said pads to force said pads against said elongated body.
 24. The straight edge clamp of claim 18, wherein said second jaw has a cam surface rotatable into engagement with said second jaw to move said second jaw between said released position to said clamped position.
 25. The straight edge of clamp of claim 18, wherein said stop assembly is movable along said length of said elongated body with respect to said clamping assembly.
 26. The straight edge clamp of claim 18, wherein said hinge includes mating first and second sets of knuckles, with said second set of knuckles being connected to said sections and said first set of knuckles being connected to said second set of knuckles.
 27. The straight edge clamp of claim 26, wherein said sections have openings for receipt of said second set of knuckles.
 28. The straight edge clamp of claim 18, wherein said hinge includes a base positioned between said first set of knuckles, said base being generally contiguous with said top of said elongated body when said sections of said straight edge clamp are generally parallel.
 29. The straight edge clamp of claim 28, wherein said first set of knuckles and said base define a secondary channel which is contiguous with said central channel when said sections are generally parallel, said clamping head assembly and said end stop assembly being moveable within said secondary channel and adapted to be clamped within said secondary channel as well as said central channel. 